It was difficult for the research teams led by Roger Guillemin and Andrew Schally to discover thyrotropin-releasing hormone and gonadotropin-releasing hormone because
A) they had no access to a supplier of hypothalamic tissue.
B) the amount produced in a single individual is miniscule.
C) they were unable to characterize the hormones once isolated.
D) they were the first to hypothesize that such hormones existed.
E) there was no assay for testing the substance they had isolated.

Question

Quizplus · Accepted Answer

The amount of thyrotropin-releasing hormone and gonadotropin-releasing hormone produced in a single individual is very small, which made it difficult for researchers to isolate and identify the hormones.

It Was Difficult for the Research Teams Led by Roger